Getting to Downtown San Francisco via BART:
Getting to Downtown San Francisco: Typically it costs $12 to $15 to take the BART from the SFO Airport station into downtown San Francisco round trip. The BART does not run 24/7, and travelers heading back to their hotels near the airport will need to be thinking about wrapping up their night around 11:30PM as the BART trains stop running shortly after midnight.
Getting to San Jose & Silicon Valley via Caltrain
Getting to San Jose from SFO can be accomplished by taking the Caltrain. The Caltrain schedule can be limited especially on the weekends. Stops between SFO and San Jose service Stanford and Silicon Valley.